Power supply



FIG. 1 is a perspective view of a power supply, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof, the left-side elevational view being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing a knob, buttons, power and signal ports, and text in FIGS. 1, 2, 4 and 5 depict environmental matter and form no part of the claimed design.

The broken lines showing a knob, buttons, power and signal ports, and text in FIGS. 1, 2, 3, and 5 depict environmental subject matter and form no part of the claimed design. 

We claim the ornamental design for a power supply, as shown and described. 